I guess if one doesn't like a player's style, then having them get beat--human or machine--provides a certain schadenfreude. Other than that, having a machine compete, other than the pure novelty of it, is about as fair (IMHO) as having a child compete against adults. It's not apples to apples, so where's the fun? Watson was a few years ago, when AI was in its infancy compared to today. As time goes by, and we get closer to the singularity, it will become even more lopsided. Let's stick with people against people.